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Michigan now has the highest Medicare Advantage penetration of any state in the CMS report, at 63.7%. Here's what that means and doesn't mean for practices billing Transitional Care Management in 2026, including the CPT 99495/99496 timeline, common denial triggers, and the prior-authorization nuance every billing team should know.

CPT 99490 and 99491 are two of the most quietly under-billed codes in internal medicine. This guide breaks down the exact differences, consent rules, time-tracking requirements, and denial patterns that decide whether this monthly revenue gets captured or lost.